Em chx học nhưng, mong cj học tốt ạ !

\(\frac{15\cdot8+15\cdot4}{12\cdot3}=\frac{15\left(8+4\right)}{12\cdot3}=\frac{15\cdot12}{12\cdot3}=5\)

Vậy : \(\frac{15\cdot8+15\cdot4}{12\cdot3}=5\)

\(\frac{15.8+15.4}{12.3}\)

\(=\)\(\frac{120+60}{39}\)\(=\)\(\frac{200}{39}\)\(=\)\(5\frac{5}{39}\)

Học tốt!!!

a, ta có \(\frac{2.\left(-13\right).9.10}{\left(-3\right).4.\left(-5\right).26}\)=\(\frac{2.\left(-13\right).\left(-3\right).\left(-3\right).2.\left(-5\right)}{\left(-3\right).2.2.\left(-5\right).\left(-2\right).\left(-13\right)}\)

rút gọn đi còn: \(\frac{-3}{-2}\)=\(\frac{3}{2}\)

15×8+15×4/12×3

= 15×(8+4)/12×3

=15×12/12×3

=15/3

=5

15,5+15,4/12,3

=4123/246

\(\frac{15.5+15.4}{12.3}=\frac{15.9}{12.3}=\frac{5.3}{4.1}=\frac{15}{4}\)

15.8+15.4/12.3 = 17.0520325203

\(\frac{15.8+15.4}{12.3}=\frac{15.\left(8+4\right)}{12.3}=\frac{15.12}{12.3}=5\)

\(\frac{15\cdot8+15\cdot4}{12\cdot3}\)

\(=\frac{15\cdot\left(8+4\right)}{12\cdot3}\)

\(=\frac{15\cdot12}{12\cdot3}\)

\(=\frac{15}{3}\)

\(=5\)

là 20/50 đó mk chăcs thế mk đầu tien k cho mk nhé

con cho điên 

huhu ai giup k 2

 ai giúp k 2

\(\frac{15.8+15.4}{12.3}=\frac{15.\left(8+4\right)}{12.3}=\frac{15.12}{12.3}=\frac{5}{1}=5\)

\(\frac{15.8+15.4}{12.3}=\frac{15.\left(8+4\right)}{12.3}=\frac{5.12}{4.3}=\frac{5}{1}=5\)

\(\frac{15.8+15.4}{12.3}=\frac{31.2}{12.3}=\frac{15.6}{6.15}=\frac{7.8}{3.075}=\frac{3.9}{1.5375}\)